Java 中的 StringBuilder 容量()，示例
原文:https://www . geeksforgeeks . org/stringbuilder-capacity-in-Java-with-examples/
StringBuilder 类的容量()方法用于返回 StringBuilder 对象的当前容量。容量是插入新字符可用的存储量。 语法:
public int capacity()
返回值:该方法返回 StringBuilder 类的当前容量。 以下程序演示了 StringBuilder 类的容量()方法: 示例 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// the capacity() Method.
class GFG {
public static void main(String[] args)
{
// create a StringBuilder object,
// default capacity will be 16
StringBuilder str = new StringBuilder();
// get default capacity
int capacity = str.capacity();
System.out.println("Default Capacity of StringBuilder = "
+ capacity);
// add the String to StringBuilder Object
str.append("Geek");
// get capacity
capacity = str.capacity();
// print the result
System.out.println("StringBuilder = " + str);
System.out.println("Current Capacity of StringBuilder = "
+ capacity);
}
}
Output
Default Capacity of StringBuilder = 16
StringBuilder = Geek
Current Capacity of StringBuilder = 16
例 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java program to demonstrate
// the capacity() Method.
class GFG {
public static void main(String[] args)
{
// create a StringBuilder object
// with a String passed as parameter
StringBuilder
str
= new StringBuilder("WelcomeGeeks");
// get capacity
int capacity = str.capacity();
// print the result
System.out.println("StringBuilder = " + str);
System.out.println("Capacity of StringBuilder = "
+ capacity);
}
}
Output:
StringBuilder = WelcomeGeeks
Capacity of StringBuilder = 28
参考: https://docs . Oracle . com/javase/10/docs/API/Java/lang/stringbuilder . html # capacity()
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